Subtitle Tool

Subtitle Tool is a lightweight and portable application which includes a bunch of useful features for processing subtitles. It is addressed toward users of any level of experience.
Thanks to its portability, installing Subtitle Tool is not necessary. It means that you can place the app on a USB flash drive or any other removable device, store it on any computer and directly access its executable file.
Therefore, the Windows Registry is not updated with new entries (minimizing the risk of system failures) and no leftover files can be found on the hard drive after deleting the app. Plus, you can carry Subtitle Tool in your pocket whenever you're on the move.
The interface of the utility integrates an intuitive layout where you can load a TXT, SRT or SUB file via the file browser ("drag and drop" is not supported).
File content is changeable in regard to each line of the subtitle along with its display and hide time, through the Edit tab. Other tabs of Subtitle Tool let you shift time fully or partially, alter the subtitle speed (frames per second), append and split subtitles, as well as check their consistency.
The biggest advantage of the program is probably represented by the option to play the movie with the attached subtitle, in order to accurately evaluate modifications and make further adjustments if necessary.
The straightforward software app worked smoothly during our evaluation without freezing, crashing or popping up error dialogs. It supports several hotkeys that can be seen in the brief help section, uses a moderate amount of system resources and lets you save files to the MicroDVD and SRT types, as well as to SSA (SubStationAlpha) scripts for VirtualDub.
Unfortunately, the app has not received updates for a very long time. But Subtitle Tool's features should be easy enough to figure out, including by users with minimal knowledge of similar software.